DES GB2012 E

The centers are ventilated exclusively by means of energy-efficient drives with SFP (specific fan power). The large heat exchangers with a recov- ery rate of 70% reduce heating and cooling needs. The areas for low-loss cast resin transformers are generally on the exterior walls, thus dispens- ing with the need for a separate mechanical cool- ing system. The insulating material used for thermal insula- tion on roofs that are accessible by vehicle must meet the highest requirements. Foam glass, also known as cellular glass, is used. This material is predominantly made from recycled glass, which is ground, heated, mixed with carbon and expanded. The use of durable German materials (Jura mar- ble, regional sandstone, domestic wood) reduces transport volumes. We can also be sure that the quarries will be recultivated, which is not the case with materials from China, South America or Egypt. Of particular importance is the ability to adapt shopping centers to the ever-changing needs of customers and retail trends without major con- struction measures: Due to the fact that systems with a static design (no prestressed structures or continuous beams) and a sufficient load reserve are used, retail space can be divided up and redeployed with a high degree of flexibility. For this same reason, reserves have been planned in the building's technical systems for future changes of use. As part of this planning, power rails with a variable connected load are used as an energy supply system. Shopping centers are only heated for a few days a year. Unlike other real estate properties, the energy savings do not come from optimised heat insulation but rather from minimised heat transfer: Solar control glass reduces the need for air-conditioning and the intensity of light required in the shops. An article by Jens-Ulrich Maier, Managing Director Construction, ECE Projektmanagement Architecture 3 1 have been! 2 3 1 DIE CENTER Sustainable? We always have been! 2 { 61 } DES ANNUAL REPORT 2012